Foul-Smelling Sundew Soil: Sulfur Smell in Summer Is Usually Normal

That Rotten-Egg Smell? Likely Harmless

In hot weather, anaerobic breakdown of peat produces hydrogen sulfide — a sulfur/rotten egg odor. It's common in summer and not necessarily root rot.

When to Worry

• Odor is extremely foul (beyond typical sulfur).
• Peat has lightened significantly (advanced decomposition).
• Pots have sat in deep water for weeks/months.

If all three: repot immediately into fresh mix.

Your Custom Mix (2 pumice : 2 orchid bark : 1 peat)

This is closer to Nepenthes media — very airy, fast-draining. It will work for sundews but holds less water. Watch tray levels closely; don't let them dry out even for a day.

Tip

Top-water occasionally to flush and oxygenate the media. Reduces anaerobic zones and smell.